Keeps YouTube progress bar visible all the time.
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Added back old updateLoop code, see code comment for explanation & how to switch between the two.
requestAnimationFrame now able to be slowed down, improved code by https://greasyforks.org/en/users/475505-tettedev
Integrated scrubber hide css to not rely on external css.
Fixed rare cases of progress & buffer bars jittering on long videos w/ chapters.
Added comments back.
Fixed wrong buffer progress when controls are hidden.
Fixed progress bar scaling.
